Disk bit



May 16, 1933. SCQTT 1,909,129-

DISK BILT Filed July 2, 1931 F L OYD I. SCOTT INVENT OR ATTORNEY Patented May 16, 1933 I new 1.. sco'r'nor? nous'rom assrenonirro nuenasvroo'r. comraNt-or nous'rou, Texas, a conronarron or TEXAS.

Application fled m a. 10:1 murmmassu.

My invention relates to disk bits employed in deep well drilling.

I contemplate the provision of a simple and cheap construction of disk bit which will '5 be strong and durable and also formed to cut rapidly in the softer formations.

I have as an object the setting of the two cutters at diiferent angles relative to the axis of the drill and thus accomplish a more effective cutting action. and also effect the better turning of the cutters and prevent their clogg I desire to mount each cutter so as to cut a different track on the well bottom and still l6 bring each cutter into contact with the wall of the well to provide turning traction and steady the rotative action of the drill.

' The invention resides largely in the mounting and positioning of the cutters on the head whereby the above objects are accomplished.

In the drawing Fig. 1 is a side view largely in central vertical section showing the construction of the invention. Fig. 2 is a bottom plan view illustrating the contact of the 2 cutters with'the side of the hole.

My drill bit body 1 is approximately c lindrical with an upper threadedshank 2 t ere-- on. The lower end of the body is flattenedand tapered downwardly at 3terminating in a head 4. This head has opposedfiat faces 4 and 5 which are in planes not parallel but inclined at different angles relative to the axis of the bit. 4

As will be seen from Fig. 1 the side face 85' 5 is inclined slightl to the right and toward the central axis of t e bit at its lower end, but

the face 6 is inclined still farther to the-right at a more'acute angle relativethereto and away from said axis. 'Thus the lower ex- 40 tremity 7 is thicker than at a point farther up on the head. A water channel 8 in the body connects with the channel 9 in the head.

Said channel 9 discharges into a flared opening 10at the lower end which provides a discharge orifice large enough to prevent clogging under ordinary circumstances.

Each face 5 and 6.has a laterally extendin cutter pin or shaft 11 inte al with the hea and threaded to receive a ushing 12. Said bushing has a radialflange at the outer end large part 'of the weight of thebit an drill stem and willcut rapldly. B': inclining the head 4 the cutter B is brough center and will, cut about the center in adand a washer 13 is fitted on the shaft between the inner end of the bushing and the face-of the head. Between the washer and. the flangeisa seat14 for'the cutter 15.

The cutter is preferably made as shown with amarginal cutting edge 16 and a curved, inner face 17.. The bushing is locked against accidental unscrewing. by a lock washer or plate 18 held in-position by acap-screw-19 screwed into the endof the shaft 11.

The effectiveness'of m bit is due to the relative angxlesand positions of the cutters. The cutter adjacent the face 6 is oflfset both vei-ticallyand horizontally from the cutter B which is parallel with the. face-5. Thus the cutter B cuts nearer the centerof the hole and somewhat in advance of the cutter. A. Each cutter contacts with the side of the hole as will be apparent from Fig. 2. The cutter B bears strongly against the bottom of the hole, and the tractionqis .hence I suflicient 'between this cutter and the bottom-of the hole so that .thecutter B will rotate and" not clog. The

cuttenAwill also turn for the. reason that it is inclined more nearlyso. that it will have a true rollingengagement with the wall of the well. That is,it is in a position where it rolls easier and scrapes lessthan the cutter B.

' The. bottom of. the hole will bemore nearly flat than isthe casewith the ordinary disk bit. The cutter B cuts the bottom and some of the sidewall, and thecutter A cuts the side wall above the cut made by the cutter B. It will be seen that the cutter B will sup ort a t close to the vanc'e of theother cutter. Thecutter A cuts and preserves. the ga-geof the hole,'making as lightly oversize hole.

The advantage'of this construction lies inthe rapid and smoothoperation of the bit in use. This construction cuts distinctly faster by test than' the usual type o'fdiskbut with symmetricallymou'ntedcutters; It does not stick OlblOg and is more reliable inuse.

' WhatIclaimas newis:

s1. A disk bit including a body,1a head at? the lower end having. opposed flatfaces inno clined at diiferent angles relative to the axis of said bit body, cutter shafts integral with the head and extending at right angles to said faces, and two disk shaped cutters a single one mounted rotatably on each of said shafts, said two cutters serving to cut the full bottom of the hole. a

2. A disk bit including a body, a head at the lower end having opposed fiat faces inclined at different angles relative to the axis of said bit body, cutter shafts integral with the head and extending at right angles to said faces, and'cutters rotatabl mounted on said shafts, the shafts of one 0 said cutters being oifset both vertically and laterally relative to the other. g

3. A disk bit including a body, a head at the lower end having opposed flat-faces, both of which are inclined in the same direction but at different angles relative to the axis of the bit body, cutter shafts integral with the head and extending at right angles to said faces, and a single cutter rotatably mounted on each of said shafts. I

4. A disk bit including the lower end having opposed fiat faces, cutters mounted parallel with saidfaces on said head, both said cutters being inclined in the same direction relative to the bit axis, but at different angles so as to diverge at their lower sides, wherebyone cutter will cut in advance of the other both cutters together acting t cut the full bottom of the hole.

5. A disk bit including a body, a head having opposed cutter shafts formed integral therewith, two cutters rotatably mounted one One each of-said shafts, said head being inclined toward one side of the bit axis, said cutters being mounted at different angles relative to said head in planes converging up wardly said two cutters together serving to cut the full bottom of the hole. Z

6. A bit body, a flattened head thereon, inclined toward one side'of .the bit axis, two cutter shafts on said head, cutters mounted a body, a head at FLOYD L. SCOTT.

rotatably one on each of said shafts, said cutters being inclined toward each other at their upper sides, said two cutters together serving to cut the full bottom of the hole.

I 7. A bit body, a head thereon inclined toward one side of the axis of the body, outter supporting means on opposite sides of said head,1 and two cutters thereon inclined in planes converging upwardly, but at difierent angles relative to the axis of the bit, said two cutters together serving to cut the full bottom of the hole.

8. A disk bit including a body, ahead inclined laterally fromsaid body, acutter thereon inclined to drill thebottom of the hole, and another cutter inclined at a different angle relative to the axis of the bit and mount ed to engage the wall of the hole tothe rear of said first mentioned cutter, said two out- 

